Skip to main content

Full text of "Handbook Of Chemical Engineering - I"

POWER GENERATION AND TRANSMISSION
21
steam rate of the actual engine in average good practice may be obtained by dividing the appropriate tabular value by the appropriate one of the following factors: with high superheat, the factor is about 0.6.
	Saturated steam	
	Condensing	Non-condensing
Simple                  . . .	0.4 0.5 0.6	0.6 0.65
Compound .......		
Triple		
		
(From MARKS' Mechanical Engineers' Handbook)
STEAM INITIALLY DRY.   BACK PRESSURE, 2 LB. ABS.
Absolute steam pressure, pounds per square inch
Katio					
of	70	100	130	160	215
expansion					
	Steam consumption, pounds per indicated horsepower per hour				
5	13.8	13.2	12.8	12.5	
7	12.6	12.1	11.8	11.6	11.3
10	11.8	11.2	10.9	10.7	10.4
15	11.2	10.5	10.1	9.9	9.6
20	10.9	10.2	9.7	9.5	9.1
25	10.8	10.0	9.55	9.3	8.9
30	10.5	9.8	9.4	9.1	8.7
40			9.3	9.0	8.5
50				8.9	8.4
STEAM INITIALLY DRY.   BACK PRESSURE, 16 LB. ABS.
2	26.4	23.2	21.2	20.0	18.5
3	23.8	20.4	19.0	17.7	16.6
4	23.0	19.4	17.5	16.4	15.3
5		19.0	16.8	15.7	14.5
6			16.6	15.3	14.0
7				15.2	13.7
10					13.5
(From MARKS' Mechanical Engineers' Handbook)